back pressure from something! please help me!!!!!
when i pull a hill under a load it pulls fine.when i top hill and let off fuel it makes a weird back pressure noise & sometimes smokes black smoke.its an 04 6.0 with 116,000 on it. thanks for any help. i dont know if i am posting properly.
when i pull a hill under a load it pulls fine.when i top hill and let off fuel it makes a weird back pressure noise & sometimes smokes black smoke.its an 04 6.0 with 116,000 on it. thanks for any help. i dont know if i am posting properly.